Komatsu PC200-8M0, Shop Manual, Page: 818 / 1254

305 Troubleshooting by failure code, Part 5
Failure code [DY2DKB] Wiper Drive (Fwd) Short
40-305
46
PC200, 200LC, 220, 220LC-8M0
SEN06137-00
Failure code [DY2DKB] Wiper Drive (Fwd) Short
Action
level
Failure code
Failure
Wiper motor Drive Foward rotation Short Circult
(Pump controller system)
– DY2DKB
Detail of failure
q
When outputting current to normal rotation side of wiper motor drive, abnormal current flows in cir-
cuit and short circuit is detected.
Action of con-
troller
q
Stops outputting current to wiper motor drive forward side.
q
Even if cause of failure disappears, machine does not become normal until starting switch is turned
to OFF position.
Problem on
machine
q
Windshield wiper does not operate.
Related infor-
mation
q
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot be mea-
sured at pump controller connector.
q
Method of reproducing failure code: Turn starting switch to ON position and set wiper switch to INT
or ON.
Cause Procedure, measuring location, criteria and remarks
1
Defective wiper motor
(internal short circuit or ground
fault)
1. Turn starting switch to OFF position.
2. Disconnect connector M05 and connect T-adapters to female side.
Between M05 (female) (3) and (1) Continuity
Between M05 (female) (3) and ground Resistance Min. 1 M
z
2 Short circuit in wiring harness
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and M05 and connect T-adapter to wiring
harness side of either of them.
Between C02 (female) (119) and (114), or between
M05 (male) (1) and (3)
Resistance Min. 1 M
z
3
Ground fault in wiring harness
(contact with ground circuit)
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and M05 and connect T-adapter to wiring
harness side of either of them.
Between C02 (female) (119) or M05 (male) (3) and
ground
Resistance Min. 1 M
z
4 Defective pump controller
If no abnormality is found by above checks, pump controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
q
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector M05.
3. Turn starting switch to ON position.
4. Turn wiper switch ON and OFF, and troubleshoot.
Between M05 (3) and
(5)
Wiper switch:
OFF
Voltage Max. 3 V
Wiper switch: ON Voltage
Pulse below 3 V
io
above 20 V